Clamp-fan attachment for machinery



J. w. MIGRATH. CLAMP FAN ATTACHMENT FOR MACHINERY. A Q I APPLIGATIONFILED FEB. 24, 1908.

898,492. Patented Sept. 15,1908.

THE NORRIS PETERS co., WASHINGTON, 04 c7 UNITED STATES PATENT OFFICE.

CLAMP-FAN ATTAOHIMENT FOR MACHINERY.

Specification of Letters Patent.

Patented Sept. 15, 1908.

Application filed February 24, 1908. Serial No. 417,583.

To all whom it may concern:

Be it known that I, JOHN W. MIGRATH, a citizen of the United States,residing in the city of Chicago, county of Cook, and State of Illinois,have invented a new and useful Improvement in Clamp-Fan Attachments forIt is easily applied by putting-the clamps.

on the hub projection of the balance Wheel or shaft of the sewingmachine, or other machinery and screwing it on very firmly. It is simpleto construct. It is firmly made of the best cold rolled steel and whenfirmly afiached to the machine is safe and servicea e.

Figure 1 in the accompanying drawing which forms a part of thisspecification, is a view in perspective of the fan attached to theprojecting hub of the balance wheel of a machine and inclosed by aprotecting guard. Fig. 2. is a view in perspective of the fan detached.

The following is a brief description of the diiferent parts of the fan.

11 are the clamp members. 22 the screws and nuts. Fig. 1, shows the modeof attaching the fan firmly on the projecting hub of the balance wheelor shaft of machine, which hub is designated by 3.

44 are the arms which project from the clamp to end where the fan bladesare riveted on.

5 is the concave or front side of a blade.

6 is the brace, holding the arms firmly.

77 are the rivets holding the blade on the arms.

88 are the rivets holding the brace that holds the arms firmly.

9 is the convex or back side of blade.

The concave or front of blades is set at a 'slight angle to the plane ofrotation, the left edge about an inch further back than the right edge.This position of the blades is given to force the current of air to theleft, as the right edge of the blades first catches the air and forcesit down in the concave dish of the blade in greater volume than a flatblade would do and out in a more compact current on the upward slant ofthe lower left side almost at right angles towards the needle end ofmachine, or between the machine and operator, or directly on theoperat'or (in hot weather) as desired.

The change in the direction of the current is made by slightly changingthe front edge of the blades of the fan to the right or left.

' See dotted lines Nos. 11 and 12 Fig. 2. If

the current is too strong on the operator and wanted more towards themachine by shifting the front edge of the blades slightly to the leftthe current is sent in the direction wanted. If the current is too muchon the machine, then twist the blades to the right slightly. See dottedlines in drawing Fig. 2, Nos. 11 and 12. The angle of the blades canalso be changed by slightly bending the section of the arm to which theblades are fastened either towards or from the axis of rotation.

The guard frame is made of g, tined wire and covered with fine wiremesh, and is intended to be screwed to the machine table.

The fan is made in two sizes. One with two blades with a segment cutoff, and one with four blades for stronger currents of air for differentkinds of work and machines. The reason why a segment is cut off theblades of the two bladed fan for the sewing machines run by power, isthat a full circle blade interferes with the bobbin winder on somemachines.

The reason for using the concave or dish shaped blade has been explainedas to gather the current of air in a more compact volume that it can bedirected better than it possibly could be done with a fiat faced blade.

What I claim is- A fan to be attached to machinery the combination withtwo clamp-members adapted to embrace a shaft, means for clamping themagainst said shaft, arms projecting from said clamp-members in thedirection of the In testimony of all which I have hereunto axis of theshaft and bent into directions rasubscribed my name.

dial to the shaft at their outer ends fan blade secured to theextremities of the radial JOHN M IGRATH 5 portions of the arms, and abrace bar secured Witnesses:

to the radial portions of the two diametrically JOHN F. MILLER,

opposite arms. O. SANDMEYER.

